Synonym of MORDANT

Answer: Option B

Mild : not severe, serious, or harsh.
Sarcastic : marked by or given to using irony in order to mock or convey contempt.
Festering : (of a wound or sore) forming pus; septic.
Depressed : (of a person) in a state of unhappiness or despondency.
Mordant : (especially of humour) having or showing a sharp or critical quality; biting.

Synonym of Mordant is Sarcastic